Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Heating Systems

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Lake Orion, MI
    Posts
    2

    Heating Systems

    I purchased a home with an inground pool in September of 2014. I had use of the pool for 2 weeks before I had to close it for the winter. So I'm new to pool ownership and I am new to TFP. I would like to install a heating system and would like to get some inputs on gas vs. electric. Of course, I have a host of questions I'd like to submit, but thought I'd start out simple. My pool is Grunit, 20000 gal, 21' X 34'. Any suggestions would be greatly appreciated.
    Inground, 20000 gal, Grunet, Hayward super pump, Hayward sand filter, chlorinated system.

  2. Back To Top    #2
    BoDarville's Avatar
    Join Date
    Jun 2012
    Location
    DFW, Texas
    Posts
    3,840

    Re: Heating Systems

    Welcome to TFP!

    When it comes to heating, it will take a given number of BTU's to heat a volume of water to a target temperature. If your goal is to heat the water the quickest way possible, I would suggest a natural gas heater and get the largest one that will work with your existing gas line. If there is no existing gas line and you need to have a new one installed, then you can specify a properly sized line to work with the heater you are considering. Talk to your gas pipe fitter to see if there are any other restrictions with regard to your existing gas setup.

    Many people think they will save on their gas bill if they install a smaller heater, but this is a fallacy. For example, if you wanted to heat your pool by 10F, it will take a given amount of BTU's to do that. A 400K BTU heater will do the job in about half the time compared to a 200K BTU. Either way, you are still using the same amount of BTU's (and thus the same amount of gas) to heat the water to your target temperature. One factor to look into is the efficiency rating of the heater. A higher efficiency rating means that more of the heat will go into heating the pool vs. being lost into the atmosphere. For example, a 400K BTU heater with a 90% efficiency rating means that 360K BTU will go towards heating the water whereas the same heater with an efficiency rating of 80% would only contribute 320K BTU's of heat to the pool.

    I must say, using the term "quick" in the context of heating a pool is a relative term. Even with a 400K BTU natural gas heater like I have, you can expect about a 2F rise in water temperature per hour. And, although natural gas is usually the least expensive source to use for heating (compared to electric or propane), you will notice a slight bump in your gas bill whenever you use the heater for any length of time. Heating pool water is expensive!

    I have attached a spreadsheet that I created that will give you some idea of the cost and time needed to heat a pool to a target temperature using a natural gas heater. It takes the above-mentioned considerations into effect as well as others (wind, ground temperature, sunlight, ambient outdoor temperature). Several members have used this calculator and have reported back that it has been pretty accurate.


    HeaterCalculator.zip
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  3. Back To Top    #3
    Defgufman's Avatar
    Join Date
    Mar 2015
    Location
    Savannah GA
    Posts
    577

    Re: Heating Systems

    Quote Originally Posted by BoDarville View Post
    Welcome to TFP!

    When it comes to heating, it will take a given number of BTU's to heat a volume of water to a target temperature. If your goal is to heat the water the quickest way possible, I would suggest a natural gas heater and get the largest one that will work with your existing gas line. If there is no existing gas line and you need to have a new one installed, then you can specify a properly sized line to work with the heater you are considering. Talk to your gas pipe fitter to see if there are any other restrictions with regard to your existing gas setup.

    Many people think they will save on their gas bill if they install a smaller heater, but this is a fallacy. For example, if you wanted to heat your pool by 10F, it will take a given amount of BTU's to do that. A 400K BTU heater will do the job in about half the time compared to a 200K BTU. Either way, you are still using the same amount of BTU's (and thus the same amount of gas) to heat the water to your target temperature. One factor to look into is the efficiency rating of the heater. A higher efficiency rating means that more of the heat will go into heating the pool vs. being lost into the atmosphere. For example, a 400K BTU heater with a 90% efficiency rating means that 360K BTU will go towards heating the water whereas the same heater with an efficiency rating of 80% would only contribute 320K BTU's of heat to the pool.

    I must say, using the term "quick" in the context of heating a pool is a relative term. Even with a 400K BTU natural gas heater like I have, you can expect about a 2F rise in water temperature per hour. And, although natural gas is usually the least expensive source to use for heating (compared to electric or propane), you will notice a slight bump in your gas bill whenever you use the heater for any length of time. Heating pool water is expensive!

    I have attached a spreadsheet that I created that will give you some idea of the cost and time needed to heat a pool to a target temperature using a natural gas heater. It takes the above-mentioned considerations into effect as well as others (wind, ground temperature, sunlight, ambient outdoor temperature). Several members have used this calculator and have reported back that it has been pretty accurate.


    HeaterCalculator.zip
    Great information, thank you BoDarville
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

  4. Back To Top    #4

    Join Date
    May 2015
    Location
    Lake Orion, MI
    Posts
    2

    Re: Heating Systems

    Thanks for your advise, BoDarville!
    Inground, 20000 gal, Grunet, Hayward super pump, Hayward sand filter, chlorinated system.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •